fix: p and P differ in V mode, resolved and tested.

P should not replace the register, p should

internal/action/paste.go

@@ -240,9 +240,11 @@ func (a PasteBefore) WithCount(n int) Action {
 	return PasteBefore{Count: n}
 }
 
-// VisualPaste implements Action (p in visual mode) - replaces selection with register content
+// VisualPaste implements Action (p/p in visual mode) - replaces selection with
+// register content when Replace flag is set
 type VisualPaste struct {
 	Count   int
+	Replace bool
 }
 
 // VisualPaste.Execute: Replaces visual selection with register content (p in visual mode).
@@ -266,11 +268,11 @@ func (a VisualPaste) Execute(m Model) tea.Cmd {
 
 	switch mode {
 	case core.VisualMode:
-		visualCharPaste(m, reg, start, end)
+		visualCharPaste(m, reg, start, end, a.Replace)
 	case core.VisualBlockMode:
-		visualBlockPaste(m, reg, start, end)
+		visualBlockPaste(m, reg, start, end, a.Replace)
 	case core.VisualLineMode:
-		visualLinePaste(m, reg, start, end)
+		visualLinePaste(m, reg, start, end, a.Replace)
 	}
 
 	// Exit visual mode
@@ -295,7 +297,7 @@ func normalizeSelection(m Model) (core.Position, core.Position) {
 }
 
 // visualCharPaste: Handles paste operation in visual (character) mode.
-func visualCharPaste(m Model, reg core.Register, start, end core.Position) {
+func visualCharPaste(m Model, reg core.Register, start, end core.Position, replace bool) {
 	win := m.ActiveWindow()
 	buf := m.ActiveBuffer()
 
@@ -344,11 +346,13 @@ func visualCharPaste(m Model, reg core.Register, start, end core.Position) {
 	}
 
 	// Update register with deleted text
+	if replace {
 		m.UpdateDefaultRegister(core.CharwiseRegister, []string{deletedText})
+	}
 }
 
 // visualBlockPaste: Handles paste operation in visual block mode.
-func visualBlockPaste(m Model, reg core.Register, start, end core.Position) {
+func visualBlockPaste(m Model, reg core.Register, start, end core.Position, replace bool) {
 	win := m.ActiveWindow()
 	buf := m.ActiveBuffer()
 
@@ -400,11 +404,13 @@ func visualBlockPaste(m Model, reg core.Register, start, end core.Position) {
 	win.SetCursorCol(startCol)
 
 	// Update register with deleted block text (joined)
+	if replace {
 		m.UpdateDefaultRegister(core.CharwiseRegister, []string{strings.Join(deletedLines, "\n")})
+	}
 }
 
 // visualLinePaste: Handles paste operation in visual line mode.
-func visualLinePaste(m Model, reg core.Register, start, end core.Position) {
+func visualLinePaste(m Model, reg core.Register, start, end core.Position, replace bool) {
 	win := m.ActiveWindow()
 	buf := m.ActiveBuffer()
 
@@ -451,7 +457,9 @@ func visualLinePaste(m Model, reg core.Register, start, end core.Position) {
 	win.SetCursorCol(0)
 
 	// Update register with deleted lines
+	if replace {
 		m.UpdateDefaultRegister(core.LinewiseRegister, deletedLines)
+	}
 }
 
 // extractCharSelection: Extracts text from a character selection range.
@@ -531,5 +539,5 @@ var _ Repeatable = VisualPaste{}
 
 // VisualPaste.WithCount: Returns a new VisualPaste with the given count.
 func (a VisualPaste) WithCount(n int) Action {
-	return VisualPaste{Count: n}
+	return VisualPaste{Count: n, Replace: a.Replace}
 }

internal/editor/integration_paste_test.go

@@ -1552,6 +1552,46 @@ func TestVisualPasteRegisterBehavior(t *testing.T) {
 			t.Errorf("register type = %v, want LinewiseRegister", reg.Type)
 		}
 	})
+
+	t.Run("vP does not put deleted text into register", func(t *testing.T) {
+		tm := newTestModel(t,
+			WithLines([]string{"hello world"}),
+			WithCursorPos(core.Position{Line: 0, Col: 0}),
+			WithRegister('"', core.CharwiseRegister, []string{"NEW"}),
+		)
+		sendKeys(tm, "v", "l", "l", "l", "l", "P") // select "hello", paste "NEW"
+
+		m := getFinalModel(t, tm)
+		// After visual paste, the deleted "hello" should be in the register
+		reg, ok := m.GetRegister('"')
+		if !ok {
+			t.Fatal("unnamed register not found")
+		}
+		if len(reg.Content) != 1 || reg.Content[0] != "NEW" {
+			t.Errorf("register content = %q, want 'NEW'", reg.Content)
+		}
+	})
+
+	t.Run("VP does not put deleted line into register", func(t *testing.T) {
+		tm := newTestModel(t,
+			WithLines([]string{"line one", "line two"}),
+			WithCursorPos(core.Position{Line: 0, Col: 0}),
+			WithRegister('"', core.LinewiseRegister, []string{"REPLACED"}),
+		)
+		sendKeys(tm, "V", "P")
+
+		m := getFinalModel(t, tm)
+		reg, ok := m.GetRegister('"')
+		if !ok {
+			t.Fatal("unnamed register not found")
+		}
+		if len(reg.Content) != 1 || reg.Content[0] != "REPLACED" {
+			t.Errorf("register content = %q, want 'REPLACED'", reg.Content)
+		}
+		if reg.Type != core.LinewiseRegister {
+			t.Errorf("register type = %v, want LinewiseRegister", reg.Type)
+		}
+	})
 }
 
 func TestVisualPasteEdgeCases(t *testing.T) {

internal/input/keymap.go

@@ -134,7 +134,8 @@ func NewVisualKeymap() *Keymap {
 			"c": operator.ChangeOperator{},
 		},
 		actions: map[string]action.Action{
-			"p": action.VisualPaste{Count: 1},
+			"p": action.VisualPaste{Count: 1, Replace: true},
+			"P": action.VisualPaste{Count: 1, Replace: false},
 			".": action.Repeat{Count: 1},
 			// ":":      action.EnterComandMode{}, // Different OP
 		},